User manual

MAX12 Data Sheet MAX12
REMOTE
LO IMP
DELAY ON
CUT
HFA
SPKR
21 3 4 5 6 87
LO IMP
1
REMOTE
21 3 4 5 6
2 3 4
ONON
Frequency response correction of HFA circuit
(only available with E-PAC version 2)
E-PAC version 1 E-PAC version 2
E-PAC Configuration for LINEAR mode
AMP-L module switches
CUT switch and indicator
Set to CUT, a high pass filter with a 130 Hz cut-off frequency is
inserted in the controller signal path. The yellow CUT LED
illuminates. MAX12 is now configured for use with d&b C-Series
active subwoofers.
Operation with E-PAC
To drive MAX12 cabinets the E-PAC has to be configured to
LINEAR mode.
For an E-PAC version 1 and 2, the configuration is selected by
setting the appropriate DIP switches on the rear panel.
For an E-PAC version 3, the configuration is set via a front panel
digital rotary encoder in conjunction with an LCD.
In LINEAR mode all four pins on the Speakon connector are driven
by the E-PAC power amplifier, pins 1+ and 2+ carry positive
signal, 1 and 2 carry negative signal. MAX12 loudspeakers can
be used in either four wire or two wire configuration.
The E-PAC can drive a single MAX12 cabinet at an output power
of 300 watts. LO IMP mode allows the E-PAC to drive two MAX12
cabinets with a 6 dB reduction of input level to the speakers.
The CUT and HFA settings are available on versions 2 and 3. The
characteristics of the CUT setting are explained above under
"AMP-L module switches".
HFA setting
In HFA mode (High Frequency Attenuation), the HF response of the
MAX12 system is rolled off. The HFA circuit configures MAX12 to
provide a natural, balanced frequency response when a unit is
placed close to listeners in near field or delay use.
High Frequency Attenuation begins gradually at 1 kHz, dropping
by approximately 3 dB at 10 kHz. This roll-off mimics the decline in
frequency response experienced when listening to a system from a
distance in a typically reverberant room or auditorium.